The Hebrew verb matsah means to squeeze out, wring, or drain. It describes the action of extracting every last drop of liquid from something by wringing or pressing. The word appears in contexts involving both the draining of a cup and the wringing out of a fleece — carrying the sense of completeness and thoroughness.
In Psalm 75:8, the wicked must drain (matsah) the cup of God's wrath to the very dregs — wringing out every last drop. This vivid image speaks to the thoroughness of divine judgment: no portion is spared, no corner is left unexamined. Gideon's fleece test (Judges 6:38) also uses this word — he wrung out enough dew to fill a bowl. Together, these uses paint a picture of God's completeness in both provision and judgment. He withholds nothing in blessing and leaves nothing undone in justice.